Abstract
Metal pipes having an inner diameter of about 25 mm or less are frequently used as heat exchangers for power plants, gas pipes, and water pipes. However, erosion and corrosion due to long-term use may cause serious accidents, such as steam leaks, resulting in economic loss and environmental pollution. Therefore, inspection of the entire length and thickness before shipping or monitoring during operation are important technologies. However, no inspection technology including the inside of the wall thickness has been developed. The purpose was to develop an ultrasonic probe that can inspect the inner and outer surfaces from the inside of the pipe at the same time. The developed ultrasonic probe is based on an electromagnetic ultrasonic transducer (EMAT) that does not require a couplant and is then easy to install in a pipe. The EMAT for the longitudinal and for the transverse vibration mode guided wave are connected in series in order to take into account the variety of defects. First, the EMAT was successfully developed for each mode. That is, it was conducted by using the magnetostrictive effect for the longitudinal mode type and by using the Lorentz force for the transverse mode type. and evaluated to improve the performance. The reflected signal from a notch defect was then evaluated in the state that each EMAT was connected in series using any artificial defects and found to be able to detect any notches with about 10% depth or about 15% circumferential length.
Highlights
Pipes are one of the main transport tools and are the main means of transporting liquids, gases and slurries
The developed ultrasonic probe is based on an electromagnetic ultrasonic transducer (EMAT) that does not require a couplant and is easy to install in a pipe
For the purpose of the non-destructive inspection of any heat exchangers used in power plants, etc., an internal ultrasonic probe for steel pipes with diameters of 21.7 mm and 2.8 mm has been developed
Summary
Pipes are one of the main transport tools and are the main means of transporting liquids, gases and slurries. These pipes are used for a long time, and the wall of the pipe becomes thin due to corrosion, possibly causing a leak and subsequent accident [1] [2] [3]. Does it cause significant economic losses, but it affects the balance of the environment and ecology. With the increasing emphasis on environmental protection and safety, non-destructive inspection is widely used in industries, such as railways, ships, metallurgy, and machinery manufacturing, has significant economic effects, and has attracted the attention of many researchers [4] [5] [6]
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